#include <my_header.h>
// 用于给5_popen3 做测试
/* Usage: ./5_sum */
int main(int argc, char *argv[]){                                  
    int sum1;
    int sum2;
    scanf("%d%d", &sum1, &sum2);
    printf("sum :%d\n",  sum1+sum2);
    return 0;
}


